V90 Oxygen Sensor Cable Fault

I need some advice about my 2023 Volvo V90 diesel. At 144423 km, I think the oxygen sensor is failing. The error memory has a fault stored, the check engine light is on, and fuel consumption has increased. Diagnostics suggest a problem with the cable or plug connection. Has anyone else seen this with their Volvo?

4 comment(s)

I saw similar symptoms with my 2018 BMW 5 series. The error codes pointed to the exhaust sensor. Before replacing it, check the wiring and connectors for the O2 sensor. A loose connection or corroded terminal can seem like the sensor failed. It's like a faulty wire dimming a light bulb, it might not be the bulb but the connection.

Thanks. Where were the wiring and connectors you checked on your BMW? I want to check every possible point of failure before replacing anything.

On the BMW, the O2 sensor connectors were along the exhaust system near the catalytic converter. Access was tricky and needed removal of a protective heat shield. Your Volvo might be similar. Given your expertise, I think a workshop visit is a good idea.

Thanks, I took it to the workshop and the cable was the problem. The repair cost 95€. Your analogy was spot on. Thanks for your help.

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